package com.cuijq.eduservice.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.cuijq.eduschool.exceptionhandler.EduException;
import com.cuijq.eduservice.entity.EduChapter;
import com.cuijq.eduservice.entity.EduVideo;
import com.cuijq.eduservice.entity.chapter.ChapterVo;
import com.cuijq.eduservice.entity.chapter.VideoVo;
import com.cuijq.eduservice.mapper.EduChapterMapper;
import com.cuijq.eduservice.service.EduChapterService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.cuijq.eduservice.service.EduVideoService;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2021-05-09
 */
@Service
public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {
  @Autowired
  private EduVideoService videoService;//注入小节service

  //课程大纲列表,根据课程id进行查询
  @Override
  public List<ChapterVo> getChapterVideoByCourseId(String courseId) {

    //1 根据课程id查询课程里面所有的章节
    QueryWrapper<EduChapter> wrapperChapter = new QueryWrapper<>();
    wrapperChapter.eq("course_id",courseId);
    List<EduChapter> eduChapterList = baseMapper.selectList(wrapperChapter);

    //2 根据课程id查询课程里面所有的小节
    QueryWrapper<EduVideo> wrapperVideo = new QueryWrapper<>();
    wrapperVideo.eq("course_id",courseId);
    List<EduVideo> eduVideoList = videoService.list(wrapperVideo);

    //创建list集合，用于最终封装数据
    List<ChapterVo> finalList = new ArrayList<>();

    //3 遍历查询章节list集合进行封装
    //遍历查询章节list集合
    for (int i = 0; i < eduChapterList.size(); i++) {
      //每个章节
      EduChapter eduChapter = eduChapterList.get(i);
      //eduChapter对象值复制到ChapterVo里面
      ChapterVo chapterVo = new ChapterVo();
      BeanUtils.copyProperties(eduChapter,chapterVo);
      //把chapterVo放到最终list集合
      finalList.add(chapterVo);

      //创建集合，用于封装章节的小节
      List<VideoVo> videoList = new ArrayList<>();

      //4 遍历查询小节list集合，进行封装
      for (int m = 0; m < eduVideoList.size(); m++) {
        //得到每个小节
        EduVideo eduVideo = eduVideoList.get(m);
        //判断：小节里面chapterid和章节里面id是否一样
        if(eduVideo.getChapterId().equals(eduChapter.getId())) {
          //进行封装
          VideoVo videoVo = new VideoVo();
          BeanUtils.copyProperties(eduVideo,videoVo);
          //放到小节封装集合
          videoList.add(videoVo);
        }
      }
      //把封装之后小节list集合，放到章节对象里面
      chapterVo.setChildren(videoList);
    }
    return finalList;
  }

  ////删除章节的方法
  @Override
  public boolean deleteChapter(String chapterId) {
    //根据chapterid章节id 查询小节表，如果查询数据，不进行删除
    QueryWrapper<EduVideo> wrapper = new QueryWrapper<>();
    wrapper.eq("chapter_id",chapterId);
    int count = videoService.count(wrapper);
    //判断
    if(count >0) {//查询出小节，不进行删除
      throw new EduException(20001,"不能删除");
    } else { //不能查询数据，进行删除
      //删除章节
      int result = baseMapper.deleteById(chapterId);
      //成功  1>0   0>0
      return result>0;
    }
  }

  //2 根据课程id删除章节
  @Override
  public void removeChapterByCourseId(String courseId) {
    QueryWrapper<EduChapter> wrapper = new QueryWrapper<>();
    wrapper.eq("course_id",courseId);
    baseMapper.delete(wrapper);
  }
}
